Net implementation of nanosecond calculation

zhaozj2021-02-12  213

1) Establish a VC.NET managed class library

Using Namespace System;

Namespace mltimerdot

{

/ / Get the computer started to the current clock cycle

Unsigned __int64 getcyclecount (void)

{

_asm _emit 0x0f

_asm _emit 0x31

}

// Declaration .NET class

Public __gc class mltimer

{

protected:

UINT64 m_Startcycle;

UINT64 M_OVERHEAD;

PUBLIC:

Mltimer (void)

{

/ / In order to calculate a clock cycle that calls a getcyclecount ()

m_overhead = 0;

START ();

m_overhead = stop ();

}

// Calculation stop

UINT64 STOP (VOID)

{

Return getCycleCount () - m_startcycle-m_overhead;

}

// Start

Void Start (void)

{

m_startcycle = getCyClecount ();

}

__property virtual uint64 get_overhead ()

{

Return M_Overhead;

}

}

}

2) Test code

// c # Release a button test after reference

Private void Button1_Click (Object Sender, System.Eventargs E)

{

MLTIMERDOT.mltimer Timer = new mltimerdot.mltimer ();

Timer.Start ();

Thread.sleep (1000);

UINT64 CPUSPEED10 = (Ulong) (Timer.Stop () / 100000); // With this MHz that can calculate CPU

Timer.Start (); // Start

// Test code (test declare a DataTable time)

DataTable TD = New DataTable ();

UINT64 TIME1 = Timer.Stop (); // Stop

String s = string.format ("CPU {0}. {1} MHz / N declaration MLTIMER class system overhead {2: n} clock cycle / N This operating system overhead {3: N} clock cycle / n { 4: n} ns ",

Cpuspeed10 / 10, CPuspeed10% 10, Timer.overhead,

Time1,

Time1 * 1000 / cpuspeed10);

Messagebox.show (s);

}

/ * ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -------------------------------------------

The MLTIMER class library must use VC. NET development, only VC. NET can fall into assembly (cool).

Compilation completion can be used in any .NET language (of course, can also be encapsulated into API, or COM components).

Think about it can be displayed on the web later:

You used this query: xxxxx nanosecond.

Is it very cool ^ _ ^, of course, some precision calculations can be made.

This is the next article in 9CBS for the second time. I hope everyone can like it.

Demonstration code:

http://www.kairuisoft.com/uploads/mltimerdot.rar

Related Resources: Java Shanghainese Source Code and Open Source Project Source Codes

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